Johannes aumund



No. 621,482. Patented Mar. 2|, I899. J. AUMUND.

CLOCK STBIKING MECHANISM. (Application filed Sept. 17, 1898.)

(No Model.)

UNITED STATES PATENT OFFICE.

JOIIANNES AUMUND, OF ZURICH, SWITZERLAND.

CLOCK STRIKING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 621,482, dated March21, 1899.

Application filed September 1'7, 1398 Serial No. 691,237. (No model.)

To all 1.0720727, it may concern.-

lie it known that I, J OHANNES AUMUND, a citizen of the Republic ofSwitzerland, and a resident of Zurich,-Switzerland, have inven tedcertain new and useful Improvements in Striko-VVorks for Clocks andWVatches, of which the following is a full, clear, and exactspecification.

The drawings hereto annexed represent one example of putting intopractice my invention of a new repeating striking mechanismfor clocksand watches.

Figure 1 gives a front and top view. Fig. 2 shows the parts ready forstriking. Fig. 3 shows the striking mechanism in action.

The axle a of a wheel which revolves one time at each bell-stroke passesthrough the front plate of the clockwork, and on that end of the axle adisk I) is placed. The surface of the disk is divided into twelveannular grooves, almost throughout concentric,which are discontinued ata place which is in the moments of rest in a concentric position withthe pivot of lever c. A pin d, which fits into the said grooves of diskb, is attached to the left branch of lever c, which covers part of thedisk. The nose e, protruding from the periphery of the disk, meets thepin cl, thus keeping the mechanism at rest.

The center wheel z carries the unlockingpin Z,which presses upwardagainst the spring f until the latters extremity reaches the pin 71 ofthe disk I). That disengages the nosee. Thereby the bend of spring 9 ispressed against the pin L of the lever in the vicinity of the latterspivot and causes the lever to turn upward to the right until the pin onof the right branch of lever c rests against one of the striking-snailsm or y. During that movement of lever c the pin d moves on to the rightalong the space where the annular grooves are discontinued, as in Fig.2.

The unlocking-pin Z having disengaged the tion of the disk-that is, ateach bell-strokethe pin cl, owing to a slight turn of the ripples orgrooves, passes over into the next groove,which is of a larger diameter.finally pin (1 leaves the last orlongest groove, the nose 6 strikesagainst the pin (1 again and stops the striking mechanism, Fig. 1.

0 is a thin spring placed under the hub of lever c and, pressing lightlyagainstit, brakes the motion of the lever in order to prevent the pin clfrom moving radially as it passes from one groove to the next across thespace between the ends of the grooves.

While the branches of lever c are of equal lengths, the division ondisk 1) corresponds with the shape of the striking-snails.

If a repetition of the strokes is desired, it suffices to move thespring 9 upward and back again. That can be done by means of a stringover a roll orin some other practical manual way.

I claiin In combination in a repeating strike-work for clocks andwatches, a disk Z) having grooves in its face, a lever 0 having a pin 01to engage the grooves during the striking and a stop on the disk 12 toengage the pin on the lever, sub stantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

J OHANNES AUMUND.

Witnesses:

FRIEDRICH ALBERT GEIGER, JosEPH ANTON STEINEGGER.

h en'

